body {
    width: 100%;
    min-width: 320px;
    max-width: 640px;
    margin: 0 auto;
    font-size: 14px;
    color: #666;
    line-height: 1.5;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    height: 1600px;
}

a {
    text-decoration: none;
    color: #666;
}
.app {
    height: 45px;
}
ul {
    margin: 0;
    padding: 0;
    text-align: center;
    list-style: none;
}
.app ul li {
    float: left;
    background-color: #333;
    height: 45px;
    line-height: 45px;
    color: #fff;
}
.app ul li:nth-child(1) {
    width: 8%;
}
.app ul li:nth-child(2) {
    width: 10%;
}
.app ul li:nth-child(2) img {
    width: 40px;
    background-size: 40px 40px;
}
.app ul li:nth-child(3) {
    width: 57%;
}
.app ul li:nth-child(4) {
    width: 25%;
    background-color: #FE440F;
}
/* 搜索栏制作 */
.search_wrap {
    position: fixed;
    width: 100%;
    height: 44px;
    overflow: hidden;
    text-align: center;
    min-width: 320px;
    max-width: 640px;
}
.search_bnt {
    position: absolute;
    top: 0;
    left: 0;
    width: 40px;
    height: 44px;
}
.search_bnt::before {
    content: "";
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    width: 20px;
    height: 18px;
    background: url(../images/bnt.png) no-repeat;
    background-size: 20px 18px;
    margin: 14px 0 0 15px;
}
.search_login {
    position: absolute;
    top: 0;
    right: 0;
    width: 40px;
    height: 44px;
    color: #fff;
    font-size: 14px;
    margin: 10px 0;
}
.search {
    position: relative;
    height: 30px;
    background-color: #fff;
    border-radius: 15px;
    margin: 0 55px;
    margin-top: 7px;
}
.jd_icon {
    width: 20px;
    height: 15px;
    position: absolute;
    top: 10px;
    left: 10px;
    background: url(../images/jd.png) no-repeat;
    background-size: 20px 15px;
}
.jd_icon::after {
    content: "";
    position: absolute;
    top: 0;
    left: 26px;
    width: 1px;
    height: 15px;
    background-color: #ccc;
}
.sou {
    width: 18px;
    height: 15px;
    position: absolute;
    top: 10px;
    left: 46px;
    background-color: pink;
    background: url(../images/jd-sprites.png) no-repeat -81px 0;
    background-size: 200px auto;
}
.slider img {
    width: 100%;
}
/* nav 制作 */
nav {
    background-color: #fff;
}
nav a {
    float: left;
    width: 20%;
    text-align: center;
    padding-top: 10px;
}
nav a img {
    width: 40px;
    vertical-align: top;
}
nav a span {
    display: block;
}
/* 新闻模块 */
.news ul li {
    float: left;
    width: 25%;
    height: 120px;
    padding-top: 15px;
    color: #000;
    font-size: 16px;
    font-weight: 700;
}
.news ul li p {
    font-size: 14px;
    font-weight: 400;
}
.news ul li a img {
    width: 100%;
    bottom: 0;
    padding-top: 10px;
}
/* 产品模块 */
.content {
    margin-top: 330px;
}

.content ul li {
    float: left;
    width: 50%;
    padding: 5px 5px;
    box-sizing: border-box;
}
.content ul li a img {
    width: 100%;

}
.content ul li span {
    display: block;
    height: 31px;
    line-height: 16px;
    box-sizing: border-box;
    font-size: 13px;
    white-space: inherit;
    overflow: hidden;
    text-overflow: ellipsis;

}
.content ul li span img {
    float: left;
    height: 13px;
    background-size: 98px 28px;
    vertical-align:middle;
}
.content ul li  .price {
    color: #FA2C19;
    float: left;
    font-weight: 700;
    padding: 5px;
    margin-top: 10px;
    font-size: 16px;
}
.content ul li .juess {
    float: right;
    text-align: center;
    margin-top: 11px;
    height: 20px;
    background-color: #F0F2F5;
    border-radius: 10px 0 0 8px;
    padding: 3px;
}